Category Archives: Άρθρα – Ξένος Τύπος
Science: Τα σημαντικότερα επιστημονικά επιτεύγματα για το 2018
Science 2018
Το κορυφαίο επιστημονικό περιοδικό «Science» ανακήρυξε ως το σημαντικότερο επιστημονικό επίτευγμα του 2018 μια «τριπλέτα» νέων μεθόδων, που επιτρέπουν στους επιστήμονες να παρακολουθούν για πρώτη φορά διαχρονικά και με μεγαλύτερη λεπτομέρεια από κάθε άλλη φορά τη γονιδιακή δραστηριότητα και την ανάπτυξη μεμονωμένων κυττάρων ενός εμβρύου. συνεχεια εδω
A home test for Zika? CRISPR may make it possible
CRISPR, the powerful genome editor, may one day be used to detect infections or cancers in blood samples. Three papers published this week in Science show how CRISPR-based systems dubbed DETECTR and SHERLOCK distinguished the Zika virus from the closely related dengue virus in samples, as well as the cancer-causing human papillomavirus.
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Four new element names are on the table
Time to throw out that old copy of the periodic table: New names have just been penciled in forfour elements officially recognized back in December. Nihonium, moscovium, tennessine, and oganesson will grace the blocks assigned to atomic numbers 113, 115, 117, and 118, said the International Union of Pure and Applied Chemistry (IUPAC) today. Read the rest of this entry
First eukaryotes found without a normal cellular power supply
You can’t survive without mitochondria, the organelles that power most human cells. Nor, researchers thought, can any other eukaryotes—the group of organisms we belong to along with other animals, plants, fungi, and various microscopic creatures. But a new study has identified the first eukaryote that has ditched its mitochondria, suggesting that our branch on the tree of life may be more versatile than researchers thought. Read the rest of this entry
Gene Therapy Treatment Proves Effective Against Rare Blood Clotting Disorder
A single injection. That’s all someone with a factor VII deficiency would need for a life-long cure, thanks to a new gene therapy treatment developed in a collaboration of researchers at the University of North Carolina (UNC) and The Children’s Hospital of Philadelphia (CHOP).
Factor VII deficiency is a rare blood disorder that can lead to profuse bleeding after injuries, including minor cuts. Currently, patients must be injected regularly with protein factors. But the new gene therapy approach, details of which were published in the journal Blood, would require only one injection and occasional follow up to ensure that the body is still producing proper amounts of factor VII. Read the rest of this entry
Η επιγενετική στο επίκεντρο!
Μήπως τελικά ο πατέρας κληροδοτεί κάτι παραπάνω από γονίδια;
Δύο μελέτες που δημοσιεύθηκαν αυτή την εβδομάδα στο έγκυρο περιοδικό Science υποστηρίζουν το σπέρμα ποντικών φέρει μόρια RNA, τα οποία επηρεάζουν το μεταβολισμό των απογόνων τους. Το εντυπωσιακό είναι ότι και στις δύο μελέτες τα μόρια που αναγνωρίστηκαν είναι μόρια tRNA (μεταφορικό RNA)!! Φαίνεται λοιπόν ότι υπάρχουν ακόμα άγνωστες πτυχές στην λειτουργία των «γνωστών» μας tRNA. συνεχεια εδω
Συμπληρώθηκε η έβδομη περίοδος του Περιοδικού Πίνακα!
Μετά από χρόνια ερευνών, τα στοιχεία 113, 115, 117 και 118 κατέχουν πλέον μία μόνιμη θέση στον Περιοδικό Πίνακα, σύμφωνα με την Διεθνή Ένωση Καθαρής και Εφαρμοσμένης Χημείας (IUPAC).
Ως σήμερα το 113 είχε το όνομα ununtrium και το προσωρινό σύμβολο Uut. Τα υπόλοιπα τρία στοιχεία 115, 117 και 118 είχαν τα προσωρινά ονόματα unupentioum (Uup), ununseptium (Uus) και ununoctium (Uuo) αντίστοιχα. Να σημειωθεί ότι τα στοιχεία αυτά δεν απαντώνται στη φύση αλλά είναι συνθετικά και μπορούν να παραχθούν μόνο στο εργαστήριο (και μάλιστα για απειροελάχιστο χρονικό διάστημα).
Το «ταξίδι» του καλύτερου φίλου του ανθρώπου αποκαλύπτεται
Γενετική μελέτη έδειξε πως οι καταγόμενοι από τους γκρίζους λύκους, οικόσιτοι σκύλοι έχουν υπάρξει σύντροφοι του ανθρώπου εδώ και 33.000 χρόνια. συνεχεια εδω
Ancient DNA reveals how agriculture changed our height, digestion, and skin colour
This is why you can drink milk.
For the first time, researchers have analysed ancient DNA taken from humans who lived before, during, and after the agricultural revolution, allowing them to map how our ancestors’ genomes changed in response to societal shifts.
Ebola Confirmed To Be Sexually Transmitted Disease
The Ebola epidemic, which has killed over 11,000 people to date, is the most devastating outbreak of the virus in history… Read the rest of this entry
Δωρεάν επιμορφωτικές διαλέξεις στην Αστροβιολογία και την αναζήτηση εξωγήινης ζωής από το Χάρβαντ
Μια ενδιαφέρουσα εμπειρία -ευκαιρία- προσφέρει (δωρεάν) το Πανεπιστήμιο του Χάρβαρντ για όποιον επιθυμεί να μάθει κάποια πράγματα για την Αστροβιολογία και την αναζήτηση εξωγήινης ζωής.
Οι διαλέξεις ξεκινούν στις 13.10.2015. Εγγραφείτε εδώ.
New Study Suggests Viruses Are Alive, And That They Share An Ancestor With Modern Cells
A detailed new study of the origins of viruses lends weight to the argument that they are living cells, and offers us a reliable method to turn back the clock and track their evolution. read more
Ανακαλύφθηκε νέος πρόγονος του ανθρώπου (Homo naledi)
Ο Homo naledi εμφανίστηκε κοντά στη ρίζα του γένους Homo πριν από 2,5 έως 2,8 εκατομμύρια χρόνια. H αναπαράσταση του μικρόσωμου Homo naledi παρουσιάζεται στο τεύχος Οκτωβρίου 2015 του National Geographic. ΣΥΝΕΧΕΙΑ ΕΔΩ
Expanding the DNA alphabet: ‘Extra’ DNA base found to be stable in mammals
A depiction of the double helical structure of DNA. Its four coding units (A, T, C, G) are color-coded in pink, orange, purple and yellow. Credit: NHGRI
Researchers from the University of Cambridge and the Babraham Institute have found that a naturally occurring modified DNA base appears to be stably incorporated in the DNA of many mammalian tissues, possibly representing an expansion of the functional DNA alphabet.
Animation Shows 550 Million Years Of Human Evolution In Seconds
Dutch graphic designer Jurian Möller created this remarkable animation to illustrate 550 million years of evolution, complete with dates and species. Read the rest of this entry
Scientists Double The Size Of Ants
Variations in traits like height, skin color, body weight, and vulnerability to diseases fall along a spectrum, and they’re all the results of genetics combined with the environment. Read the rest of this entry
Κινέζοι επιστήμονες τροποποίησαν γενετικά ανθρώπινα έμβρυα!
Human embryos are at the centre of a debate over the ethics of gene editing.
Η ανακοίνωση κινέζων ερευνητών ότι προχώρησαν για πρώτη φορά σε γενετική τροποποίηση ανθρώπινων εμβρύων πυροδοτεί διαφωνίες μεταξύ των ειδικών για την ηθική βάση αλλά και τη χρησιμότητα της μεθόδου.
World’s oldest stone tools discovered in Kenya
The shores of Lake Turkana, where many fossils of human ancestors have been found, are also the home of what may be the oldest known tools.
Researchers at a meeting here say they have found the oldest tools made by human ancestors—stone flakes dated to 3.3 million years ago. Read the rest of this entry
How Europeans evolved white skin
Most of us think of Europe as the ancestral home of white people. But a new study shows that pale skin, as well as other traits such as tallness and the ability to digest milk as adults, arrived in most of the continent relatively recently. Read the rest of this entry
Almost 150 Of Our Genes May Have Come From Microbes
photo credit: Liya Graphics/ Shutterstock
We know that our bodies are absolutely teeming with microbes. In the average healthy human, bacterial cells outnumber our own cells 10 to 1. And let’s not forget about viruses; some studies have suggested that the number of viral particles in our body is greater than the number of human and bacterial cells combined. But what about our genomes? It turns out that our DNA, too, is less human than we thought. Read the rest of this entry
Common Science Myths That Most People Believe
photo credit: Jens Maus via Wikimedia Commons
There are a number of old wives’ tales out there regarding some basic scientific principles. Though most of them were refuted years ago, these rumors just won’t go away. Here are some of the top myths floating around out there that just aren’t true: Read the rest of this entry
Στην Εξέλιξη, τα σκαθάρια είναι παντοτινά.
Από τις πασχαλίτσες μέχρι τους χρυσούς σκαραβαίους, τα σκαθάρια ήρθαν για να μείνουν (Πηγή: Thomas G. Moertel CC BY-SA 2.5)
Λέγεται συχνά ότι, σε περίπτωση παγκόσμιας καταστροφής, τα μόνα πλάσματα που θα επιβιώσουν είναι οι κατσαρίδες. Τα σκαθάρια, όμως, αποδεικνύονται καλύτεροι εξπέρ της επιβίωσης. Read the rest of this entry
Why a powerful cancer drug only helps some patients
T cells attacking a tumor cell. SCIENCE SOURCΕ: STEVE GSCHMEISSNER
Researchers Discover Enormous Ancient Crocodile That Walked Upright
photo credit: This is a life reconstruction of Carnufex carolinensis / Jorge Gonzales
Galapagos Island Hosts First Baby Tortoises In A Century
photo credit: James Gibbs. This baby tortoise may be shy, but its future—and that of its subspecies—looks promising.
For the first time in more than a century, giant tortoises have bred successfully on the Galapagos island of Pinzón. The announcement raises hope for preserving some of the diversity that inspired Darwin’s theory of evolution. Read the rest of this entry
Human DNA enlarges mouse brains
The blue stains in these developing mice embryos show that the human DNA inserted into the rodents turns on sooner and is more widespread (right) than the chimp version of the same DNA, promoting a bigger brain.
Improved Anti-HIV Antibodies Created Through Genetic Engineering
photo credit: Lance Hayashida/Caltech Marketing & Communications and the Bjorkman Laboratory/Caltech
Part of what makes human immunodeficiency virus (HIV) so difficult to treat is its ability to elude the body’s immune system in a variety of ways. However, a recent study has described genetically-altered antibodies which have 100 times the HIV-fighting power of natural antibodies. This could be used to develop new treatments. Rachel Galimidi of Caltech was lead author of the paper, which was published in Cell. Read the rest of this entry
HIV evolving ‘into milder form’
HIV is evolving to become less deadly and less infectious, according to a major scientific study.
NASA: Earth Just Experienced the Warmest Six-Month Stretch Ever Recorded
It seems all our efforts to bake the planet are finally paying off. Foto: NASA
Ιστολόγιο για τη Βιολογία και τη Χημεία στο Λύκειο 